Access port identification systems and methods

ABSTRACT

An access port for subcutaneous implantation is disclosed. Such an access port may comprise a body for capturing a septum for repeatedly inserting a needle therethrough into a cavity defined within the body. Further, the access port may include at least one feature structured and configured for identification of the access port subsequent to subcutaneous implantation. Methods of identifying a subcutaneously implanted access port are also disclosed. For example, a subcutaneously implanted access port may be provided and at least one feature of the subcutaneously implanted access port may be perceived. Further, the subcutaneously implanted access port may be identified in response to perceiving the at least one feature.

CROSS-REFERENCE TO RELATED APPLICATION

This claims the benefit of U.S. patent application Ser. No. 60/658,518, filed 4 Mar. 2005, the disclosure of which is incorporated, in its entirety, by this reference.

BACKGROUND

Access ports provide a convenient method to repeatedly deliver a substance to remote areas of the body without utilizing surgical procedures. Ports are totally implantable within the body (i.e. subcutaneously) and may permit the infusion of medicine, parenteral solutions, blood products, or other fluids. Additionally, ports may also be used for blood sampling.

A typical port typically includes a housing assembly, a septum, and an outlet. The housing assembly and septum define a reservoir which is accessible through the septum. The outlet of the housing may communicate with a catheter which accesses a vein. Thus, the catheter may be employed for delivering a fluid from the port to a remote location in the body, for example, the superior vena cava.

In common practice, a port is implanted within the body and the catheter is routed to a remote area where a fluid is desired to be delivered. To deliver the fluid, a caregiver locates the septum of the port by palpation of a patient's skin. Port access is accomplished by percutaneously inserting a needle, typically a non-coring needle, through the septum of the port and into the reservoir. A fluid, such as a drug or other beneficial substance, may then be administered by bolus injection or continuous infusion into the reservoir. Thus, the fluid may flow through the reservoir into the catheter and finally to the site were the fluid is desired.

Ports generally come in two different types, surgical and cosmetic. Surgical ports may typically be used for delivering medicinal substances, including chemotherapy drugs which may be harmful to surrounding tissue, or for sampling blood. Cosmetic ports, on the other hand, are utilized to deliver saline or some other non-reactive substance to a prosthesis which supplements a body feature.

Generally, conventional access ports of different manufacturers or models may typically exhibit substantially similar geometries that may not be differentiable with respect to one another. Accordingly, once an access port is implanted, it may be difficult to determine the model, style, or design of the access port. Such uncertainty may be undesirable, at least for replacement timing purposes, among other reasons, especially if identification of the implanted access port is difficult to otherwise determine.

Thus, it would be advantageous to provide an access port which provides at least one identifiable characteristic that may be sensed or otherwise determined subsequent to subcutaneous implantation of the access port.

SUMMARY

One aspect contemplated by the instant disclosure relates to an access port for providing subcutaneous access to a patient. Such an access port may comprise a body for capturing a septum for repeatedly inserting a needle therethrough into a cavity defined within the body. Further, an access port according to the instant disclosure may include at least one feature structured and configured for identification of the access port subsequent to subcutaneous implantation.

Another aspect contemplated by the instant disclosure relates to a method of identifying a subcutaneously implanted access port. More particularly, a subcutaneously implanted access port may be provided and at least one feature of the subcutaneously implanted access port may be perceived. Further, the subcutaneously implanted access port may be identified in response to perceiving the at least one feature.

A further aspect of the instant disclosure relates to an access port for providing subcutaneous access to a patient. Particularly, such an access port may comprise a body configured for capturing a septum for repeatedly inserting a needle therethrough into a cavity defined within the body. Further, the access port may comprise at least one feature structured to identify the access port as being power injectable subsequent to subcutaneous implantation.

Features from any of the above mentioned embodiments may be used in combination with one another in accordance with the instant disclosure. In addition, other features and advantages contemplated by the instant disclosure will become apparent to those of ordinary skill in the art through consideration of the ensuing description, the accompanying drawings, and the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A shows a perspective view of an embodiment of an access port according to the instant disclosure;

FIG. 1B shows a schematic side cross-sectional view the access port shown in FIG. 1A;

FIG. 2 shows a perspective view of an embodiment of an access port according to the instant disclosure;

FIG. 3 shows a perspective view of an access port according to the instant disclosure;

FIG. 4 shows a perspective view of an access port according to the instant disclosure;

FIG. 5 shows a perspective view of an access port according to the instant disclosure;

FIG. 6A shows a perspective view of an access port according to the instant disclosure;

FIG. 6B shows a side view of the access port shown in FIG. 6A;

FIG. 7 shows a perspective view of an access port according to the instant disclosure;

FIG. 8 shows a simplified perspective view of a cap for forming an access port according to the instant disclosure;

FIG. 9 shows a simplified perspective view of a cap for forming an access port according to the instant disclosure;

FIG. 10 shows a simplified perspective view of a cap for forming an access port according to the instant disclosure;

FIG. 11 shows a simplified perspective view of a cap for forming an access port according to the instant disclosure;

FIG. 12 shows a simplified perspective view of a cap for forming an access port according to the instant disclosure;

FIG. 13 shows a simplified perspective view of a cap for forming an access port according to the instant disclosure;

FIG. 14 shows a simplified perspective view of a cap for forming an access port according to the instant disclosure;

FIG. 15A shows a perspective view of an embodiment of an access port according to the instant disclosure;

FIG. 15B shows a top elevation view of the access port shown in FIG. 15A;

FIG. 16 shows a perspective view of an access port according to the instant disclosure;

FIG. 17 shows a perspective view of an access port according to the instant disclosure;

FIG. 18 shows a perspective view of an access port according to the instant disclosure;

FIG. 19 shows a perspective view of an access port according to the instant disclosure;

FIG. 20 shows a perspective view of an access port according to the instant disclosure;

FIG. 21 shows a perspective view of an access port according to the instant disclosure;

FIG. 22 shows a perspective view of another embodiment of an access port according to the instant disclosure;

FIG. 23 shows a top elevation view of the assembled access port shown in FIG. 22;

FIG. 24 shows a simplified representation of a transverse cross section of the access port shown in FIGS. 22 and 23;

FIGS. 25-51 show perspective views of additional embodiments of an access port.

FIG. 52A shows a top perspective view of an embodiment of an access port with an alphanumeric message in the bottom of the port.

FIG. 52B shows a bottom perspective view of the embodiment in FIG. 52A.

DETAILED DESCRIPTION

The instant disclosure relates generally to percutaneous access and, more specifically, to methods and devices associated with percutaneous access. Generally, the instant disclosure relates to an access port for subcutaneous implantation. In one embodiment, an access port may allow a physician or other medical personnel to obtain long term percutaneous access to the interior of a patient's body. Employing an access port for percutaneous access may reduce the opportunity for infection by inhibiting fluid connections (that extend into the interior of a patient's body) from the patient's skin and from the external environment. The access device allows access to the interior of the patient without requiring a needle to pierce the skin. Further, internal components, such as a catheter or a valve, may be replaced without a surgical procedure. Features or aspects of the instant disclosure may apply to any such access ports for subcutaneous access to a patient, without limitation. The access port may be injected by hand (e.g., via a syringe including a needle) for example, or may be injected and pressurized by mechanical assistance (e.g., a so-called power injectable port).

Power injectable ports may be employed in, among other processes, for example, computed tomography (“CT”) scanning processes. More particularly, a so-called “power injector” system may be employed for injecting contrast media into a peripherally inserted intravenous (IV) line. For example, such power injectors or injection systems may be commercially available from Medrad, Inc., a subsidiary of Schering AG, Germany and may be marketed under the trademark STELLANT®. Because fluid infusion procedures are often defined in terms of a desired flow rate of contrast media, such power injection systems are, in general, controllable by selecting a desired flow rate.

More specifically, the instant disclosure relates to an access port having at least one perceivable or identifiable feature for identifying the access port, wherein the identifiable feature is perceivable after the access port is implanted within a patient. For example, at least one or perhaps multiple identifiable feature(s) of an access port contemplated by the instant disclosure may be correlative to information (e.g., a manufacturer's model or design) pertaining to the access port. Thus, an identifiable feature from an access port of a particular model may be unique in relation to most if not all other identifiable features of another access port of a different models or design. Of course, the at least one identifiable feature of an access port contemplated by the instant disclosure may be further correlative with any information of interest, such as type of port, catheter type, date of manufacture, material lots, part numbers, etc. In one example, at least one identifiable feature of an access port may be correlative with the access port being power injectable. In this way, once at least one identifiable feature of an access port is observed or otherwise determined, correlation of such at least one feature of an access port may be accomplished, and information pertaining to the access port may be obtained.

In one embodiment, at least one feature may be perceived by palpation (i.e., to examine by touch), by way of other physical interaction, or by visual observation. Accordingly, a person of interest may touch or feel the access port through the skin to perceive at least one identifying characteristic thereof. In another embodiment, at least one identifiable feature may be perceived via x-ray or ultrasound imaging. In yet a further embodiment, at least one identifiable feature may be perceived through magnetic, light, or radio energy interaction or communication with the access port.

Turning to the embodiment wherein at least one feature may be perceived through palpation, other physical interaction, or visual observation, a topography or exterior surface feature of an access port contemplated by the instant disclosure may be configured for perception. For example, referring to FIGS. 1A and 1B, an exemplary access port 10 contemplated by the instant disclosure is shown. FIGS. 1A and 1B show a perspective view and a schematic side cross-sectional view, respectively, of an access port 10 for allowing percutaneous or otherwise internal access to a patient's body. Access port 10 includes a housing or body 20 defined by a cap 14 and a base 16. Cap 14 and base 16, as known in the art, may be configured for capturing therebetween a septum 18. As shown in FIG. 1A, cap 14 and base 16 may matingly engage one another along a mating line 15. Cap 14 and base 16 may be secured or affixed to one another via mechanical fasteners such as screws or other fastening devices, may be adhesively affixed to one another, or may be affixed to one another as known in the art. Further, cap 14, base 16, and septum 18 may collectively define a cavity 36 in fluid communication with a lumen 29 of outlet stem 31.

The body 20 may be implanted in a patient 7, as shown in FIG. 1B, to dispose the cavity 36 subcutaneously within the patient 7. Also, suture apertures 66 (FIG. 1A) may be used to affix the access port 10 within the patient 7, if desired. After the body 20 is implanted in a patient 7, the upper surface of the septum 18 may be substantially flush with the surface of the skin 6 of the patient 7 and may be repeatedly punctured for creating a percutaneous passageway from the exterior of the skin of the patient into the cavity 36. The outlet stem 31 may create a fluid-communicative passageway from the cavity 36 through the outlet stem 31 and into the interior of the patient 7. A catheter may be coupled to the outlet stem 31 for fluid communication with the cavity 36 and for transferring fluid from the cavity 36 to a desired remote location from the cavity 36 and within a patient 7.

Body 20 of access port 10 may comprise a bio-compatible material such as polysulfone, titanium, or any other suitably bio-compatible material as known in the art. Accordingly, the body 20 may be formed from a bio-compatible plastic material. If desired, the body 20 may comprise a penetrable material for penetration by sutures or needles. In another embodiment, and as discussed further hereinbelow, body 20 may comprise an impenetrable material such as, for instance, a metal if desired. Body 20 may include a concave bottom or, in another embodiment, may include a flat bottom, without limitation.

According to the instant disclosure, access port 10 may comprise a body 20 exhibiting at least one identifiable feature. More particularly, as shown in FIG. 1A, body 20 may exhibit a partial generally pyramidal shape (i.e., a polygonal base having surfaces for each side of the polygon extending toward a common vertex otherwise known as a frustum). Generally, a body 20 of an access port 10 may exhibit a partial pyramidal shape extending between a generally quadrilateral shaped base positioned at reference plane 11 and a generally quadrilateral shaped upper base positioned at reference plane 9. Reference planes 9 and 11 will not be shown in FIGS. 2-21, for clarity; however, reference to planes 9 or 11 with respect to FIGS. 2-21, as used herein, will refer to corresponding reference planes analogous to reference planes 9 and 11 as shown in FIGS. 1A and 1B.

As shown in FIG. 1A, the exterior of access port 10 is substantially defined by four substantially planar side surfaces 50 connected to one another by radiuses 32. In addition, the upper topography 61 of access port 10 is defined by upper surface 60 in combination with chamfers 46A and 46B and may be further defined by the upper surface of septum 18. Explaining further, the outer periphery of upper topography 61 may be described as a generally quadrilateral exterior formed by side regions 54 and having rounded corner regions 30 adjacent side regions 54. Such a configuration may provide an access port having at least one feature that may be perceived by palpation.

It may be appreciated that there are many variations to the geometry of access port 10 as shown in FIG. 1A. For instance, while the body 20 of access port 10 may be described as a partially pyramidal shape or frustum, the instant disclosure is not so limited. Rather, one or more of side surfaces 50 may be oriented at as may be desired, without reference to any other side surfaces 50. Accordingly, for example, one of surfaces 50 may be substantially vertical while the remaining surfaces 50 may be oriented at respective, selected angles. Furthermore, it should be understood that FIG. 1A is merely exemplary and that the dimensions and shape as shown in FIG. 1A may vary substantially while still being encompassed by the instant disclosure.

FIG. 2 shows a perspective view of another embodiment of access port 10 according to the instant disclosure. As shown in FIG. 2, the exterior of access port 10 is substantially defined by a generally parallelogram-shaped base (positioned at reference plane 11 as shown in FIGS. 1A and 1B) extending generally pyramidally to a generally parallelogram-shaped upper surface (positioned at reference plane 9 as shown in FIGS. 1A and 1B). As shown in FIG. 2, radiuses 42 may be larger than radiuses 32 as shown in FIG. 1A. Furthermore, the upper topography 61 of access port 10 as shown in FIG. 2 may include rounded corner regions 40 which are larger than rounded corner regions 30 as shown in FIG. 1A. Thus, FIG. 2 shows an exemplary embodiment of an access port 10 that may be perceivably distinguishable from access port 10 as shown in FIGS. 1A and 1B. For example, a difference between one exterior of an access port contemplated by the instant disclosure and another exterior of a different access port contemplated by the instant disclosure may be determined by way of palpation.

In another embodiment, in another aspect contemplated by the instant disclosure, a template may be employed for perceiving at least one feature of an access port. For instance, a complementarily-shaped template may be positioned over and abutted against an access port contemplated by the instant disclosure so as to determine if the access port matches or substantially corresponds to the shape of the template. Such a process may reliably indicate or perceive at least one feature of an access port contemplated by the instant disclosure. Of course, a plurality of templates corresponding to different models of access ports may be serially engaged with an unknown access port so as to perceive at least one feature thereof. Such a process may allow for identification (e.g., of a model or manufacturer) of an access port contemplated by the instant disclosure.

In another aspect contemplated by the instant disclosure, an upper topography of an access port may include at least one feature for identifying the access port. For example, as shown in FIG. 3, upper surface 60 of access port 10 may be nonplanar. More specifically, upper surface 60 may be tapered or may arcuately extend downwardly (i.e., toward reference plane 11 as shown in FIGS. 1A and 1B) as it extends radially inwardly toward septum 18. Otherwise, access port 10, as shown in FIG. 3, may be configured substantially as described hereinabove with reference to FIGS. 1A and 1B. Thus, upper surface 60 is one exemplary example of at least one perceivable feature for identification of an access port contemplated by the instant disclosure.

In yet a further embodiment of an access port contemplated by the instant disclosure, side regions 54 extending between rounded corner regions 30 may exhibit at least one perceivable feature. For example, as shown in FIG. 4, access port 10 may include one or more side regions 54 that extend arcuately between adjacent rounded corner regions 30. Otherwise, access port 10, as shown in FIG. 4, may be configured substantially as described hereinabove with reference to FIGS. 1A and 1B. Side regions 54 may be congruent or symmetric with respect to one another or, in another embodiment, may be configured differently with respect to one another, without limitation.

FIG. 5 shows a further exemplary embodiment of an access port contemplated by the instant disclosure. More specifically, access port 10, as shown in FIG. 5, includes side regions 54 that form recessed regions 72 between adjacent rounded corner regions 30. Put another way, the upper topography 61 may include alternating recessed regions 72 and protruding regions 70 positioned generally about a periphery of septum 18. Otherwise, access port 10, as shown in FIG. 5, may be configured substantially as described hereinabove with reference to FIGS. 1A and 1B. Such a configuration may provide an access port having at least one identifiable feature.

In a further embodiment of an access port contemplated by the instant disclosure, FIGS. 6A and 6B show a perspective view and a side view, respectively, of an access port 10 generally configured as is described with reference to FIG. 5 but having an elongated body 20E. More specifically, elongated body 20E of access port 10, as shown in FIGS. 6A and 6B, includes a side surface 50E that extends generally from upper topography 61 downwardly (i.e., toward reference plane 11 as shown in FIGS. 1A and 1B) and having a slope (e.g., an angle with respect to a vertical axis normal to an upper surface of septum 18) which is different from the other side surfaces 50. Otherwise, access port 10, as shown in FIG. 6, may be configured substantially as described hereinabove with reference to FIGS. 1A and 1B. Such a configuration may provide an elongated body 20E of an access port 10 having an elongated side portion.

Of course, one or more side surfaces of an access port according to the instant disclosure may be configured for forming a body exhibiting a selected shape as may be desired. An elongated body portion of an access port contemplated by the instant disclosure may form, in combination with other features as described hereinabove or, in another embodiment, taken alone, at least one perceivable feature for identification of an access port according to the instant disclosure.

FIG. 7 shows a further embodiment of an access port encompassed by the instant disclosure. Particularly, as shown in FIG. 7, access port 10 may include an upper body portion 20 a and a lower body portion 20 b. Furthermore, each of upper body portion 20 a and lower body portion 20 b may exhibit a partial pyramidal shape (i.e., a frustum), wherein the body portions 20 a and 20 b are stacked vertically with respect to one another. Accordingly, upper body portion 20 a may form an overhanging rim feature 76 extending along a periphery of access port 10. Explaining further, lower body portion 20 b may have an exterior substantially defined by side surfaces 50 b and rounded corner regions 30 b, while upper body portion 20 a may have an exterior substantially defined by side surfaces 50 a, rounded corner regions 30 a, and upper topography 61. It may be appreciated that overhanging rim feature 76 may be sized and configured for perception via palpation. Such a configuration may provide a suitable access port for delivery of a beneficial or medicinal substance, the access port being identifiable (e.g., by model number, manufacturer, etc.) after implantation.

It should be understood that the instant disclosure contemplates access ports having an exterior geometry that is not quadrilateral in nature. Rather, the instant disclosure contemplates that an access port may have an exterior which is generally cylindrical, generally conical, generally elliptical, generally oval, or an exterior that is otherwise arcuate in nature. Specifically, the instant disclosure contemplates that an access port having a substantially rounded or arcuate exterior may include at least one feature configured for identification of the access port after implantation. For example, as shown in FIG. 8, shows a cap 14 that exhibits an exterior surface 78 that is substantially conical. Cap 14 may be assembled to a suitable base (not shown) for capturing a septum (not shown) as described hereinabove to form an access port 10 as generally described with reference to FIGS. 1-7.

The instant disclosure further contemplates that at least one protrusion, protruding region, recess, recessed region, undulation, or adjacent features of different elevation may comprise a feature for identifying an access port contemplated by the instant disclosure. More specifically, upper topography 61C, as shown in FIG. 8, may include a plurality of protrusions 80. Protrusions 80 may exhibit partially spherical upper surfaces that transition into a lower portion of cap 14. In further detail, protrusions 80 may be circumferentially spaced about the periphery of septum (not shown) as may be desired. In one embodiment, a plurality of protrusions 80 may be symmetrically circumferentially spaced about the periphery of septum (not shown). More generally, at least one protrusion 80 may be sized, configured, and positioned for forming at least one identifiable feature of an access port. Of course, at least one protrusion 80 may be structured for facilitating comfort of a patient within which the access port is implanted. As may be appreciated, at least one protrusion 80 or more than one protrusion 80 may be included in an upper topography 61C of an access port (not shown) contemplated by the instant disclosure.

FIG. 9 shows another embodiment of a cap 14 including at least one protrusion 80E for forming and identifying an access port contemplated by the instant disclosure after implantation thereof within a patient. Protrusions 80E may extend circumferentially about a center of revolution. Thus, protrusions 80E may exhibit a body 87 portion circumferentially extending between rounded ends 83. Further, cap 14 may have an exterior surface 78 that is substantially symmetric about an axis of revolution. More generally, body 20 may extend from a generally circular, generally elliptical, or generally oval base positioned at a lower extent 71 of the cap 14 to an upper generally circular, generally elliptical, or generally oval cross section that is smaller than a cross section of the base and is positioned at an upper extent 73 (without considering protrusions 80E) of the cap 14. In addition, side surface 51, as shown in FIG. 9, extends arcuately between the base and the upper topography 61 of cap 14. Side surface 51 may extend in a generally tapered or conical fashion, may exhibit a radius or other arcuate shape, or may otherwise transition between a cross section of the base of the access port to a cross section proximate the upper topography 61C thereof.

Further, FIG. 10 shows an embodiment of a cap 14 for forming an access port contemplated by the instant disclosure having an upper topography 61C thereof comprising alternating circumferentially extending protrusions 80E and circumferentially extending recesses 82, wherein the circumferentially extending protrusions 80E are circumferentially larger than the circumferentially extending recesses 80E. In another embodiment of an access port contemplated by the instant disclosure, FIG. 11 shows a perspective view of a cap 14 having an upper topography 61C thereof comprising alternating circumferentially extending protrusions 80E and circumferentially extending recesses 82, wherein the circumferentially extending protrusions 80E and the circumferentially extending recesses 82 are substantially equal in (circumferential) sized or extension. In yet a further embodiment of a cap 14 for forming an access port contemplated by the instant disclosure, FIG. 12 shows a perspective view of a cap 14 having an upper topography 61C thereof comprising three circumferentially extending protrusions 80E and three circumferentially extending recesses 82, arranged so as to alternate circumferentially, wherein the circumferentially extending protrusions 80E and the circumferentially extending recesses 82 are substantially equal in (circumferential) size.

FIG. 13 shows a perspective view of an additional embodiment of an cap 14 for forming an access port contemplated by the instant disclosure including an upper topography 61C including circumferentially extending protrusions 80T and circumferentially extending recesses 82T, wherein transition regions 81 are provided between circumferentially extending protrusions 80T and circumferentially extending recesses 82T. Such transition regions 81, as shown in FIG. 13, may taper or generally smoothly transition between a circumferentially extending protrusion 80T and a circumferentially extending recess 82T. Also, FIG. 14 shows a perspective view of an additional embodiment of a cap 14 for forming an access port contemplated by the instant disclosure including an upper topography 61C including protrusion regions 96 and recessed regions 98 that transition between one another and alternate circumferentially so as to form an undulating topography comprising upper topography 61C. Such an undulating topography, as shown in FIG. 14, generally smoothly transitions between circumferentially adjacent protrusion regions 96 and recessed regions 98.

In a further embodiment of an access port contemplated by the instant disclosure, FIG. 15A and 15B show a perspective view and a top elevation view, respectively, of an access port 10 generally configured as is described with reference to FIG. 5 but may include at least one nonplanar side surface. In another embodiment, access port 10 as shown in FIG. 15 may be configured as shown in FIGS. 1-4 or FIGS. 6-7, or any embodiments described hereinbelow, without limitation. More specifically, elongated body 20 of access port 10, as shown in FIGS. 15A and 15B, includes three side surfaces 50R that extend arcuately (as shown in FIG. 15B). Such a configuration may provide an access port 10 that is identifiable subsequent to implantation. In yet another embodiment of an access port contemplated by the instant disclosure, FIG. 16 shows a perspective view of an access port 10 including a side wall 100 that truncates a portion of a radius 32 formed between side surfaces 50 of access port 10. It may also be noted that such an access port 10 may include three suture apertures 66, which may, taken alone or in combination with at least one other feature, comprise at least one identifiable feature of an access port contemplated by the instant disclosure. In addition, as shown in FIG. 16, outlet stem 31 may extend from side wall 100.

In a further embodiment of an access port contemplated by the instant disclosure, FIG. 17 shows a perspective view of an access port 10 wherein cap 14 and base 16, when assembled to one another along mating line 15, form a flange feature or lip feature 102 that extends about at least a portion of the periphery of the access port 10. As shown in FIG. 17, lip feature 102 extends substantially about the periphery of the access port 10, proximate to the mating line 15 between cap 14 and base 16. Such a feature may comprise at least one identifiable feature of an access port contemplated by the instant disclosure. Thus, it may be appreciated that a peripheral discontinuity between the cap 14 and base 16 may be formed generally along the mating line 15 therebetween. In the embodiment of an access port as shown in FIG. 7, an overhanging rim feature 76 may comprise a peripheral discontinuity or, in the embodiment of an access port as shown in FIG. 17, a lip feature 102 may comprise a peripheral discontinuity.

In a further embodiment of an access port contemplated by the instant disclosure, FIG. 18 shows a perspective view of an access port 10 wherein at least a portion of at least one side surface 50 is concave. As shown in FIG. 18, concave region 106 of side surface 50 is concave. Concavity (i.e., a concave region 106) may be exhibited over at least a portion of a side surface of an access port of any of the embodiments as shown herein, without limitation. Thus, at least one side surface 50 of an access port contemplated by the instant disclosure having at least at least a portion thereof that is concave is one exemplary example of at least one perceivable feature for identification of an access port contemplated by the instant disclosure.

In a further embodiment of an access port contemplated by the instant disclosure, FIG. 18 shows a perspective view of an access port 10 wherein at least a portion of at least one side surface 50 is concave. As shown in FIG. 18, region 106 of side surface 50 is concave. Concavity may be exhibited over at least a portion of a side surface of an access port of any of the embodiments as shown herein, without limitation. Thus, at least one side surface 50 of an access port contemplated by the instant disclosure having at least at least a portion thereof that is concave is one exemplary example of at least one perceivable feature for identification of an access port contemplated by the instant disclosure.

In a further embodiment of an access port contemplated by the instant disclosure, FIG. 19 shows a perspective view of an access port 10 generally configured as is described with reference to FIG. 6A and 6B. More specifically, elongated body 20ER, as shown in FIG. 19 includes a side surface 50ER that extends arcuately from upper topography 61 of access port 10 downwardly (i.e., toward reference plane 11 as shown in FIGS. 1A and 1B). Such a configuration may provide an elongated body 20E of an access port 10 having an elongated side portion.

It should be understood from the above-described various embodiments of an access port contemplated by the instant disclosure that many variations, additions, or different features may be encompassed by the instant disclosure. Thus, the instant disclosure is not limited to the several above-described exemplary embodiments.

For example, as shown in FIG. 20, which shows a top elevation view of an access port 10 contemplated by the instant disclosure, an access port 10 may include a side wall 100 that at least partially truncates a radius 32 between side surfaces 50, outlet stem 31 extending from side wall 100, and at least one of a concave region 106 and an arcuate surface 50R. Further, as shown in FIG. 20, suture apertures 66 may be positioned so as to identify the access port 10 after subcutaneous implantation.

Additionally, the instant disclosure contemplates access ports having an exterior geometry that is polygonal in nature. Specifically, the instant disclosure contemplates that an access port contemplated by the instant disclosure may exhibit a generally triangular exterior. Thus, as shown in FIG. 21, body 20 may exhibit a generally pyramidal or tapered shape (i.e., a polygonal base having surfaces for each side of the polygon extending toward a common vertex). Generally, a body 20T of an access port 10 may extend between a generally triangularly-shaped base and a relatively smaller, generally triangularly-shaped upper base. Accordingly, the exterior of access port 10 may be substantially defined by three side surfaces (e.g., 50, 50R, 102, 50E) having radiuses 32 extending therebetween. In addition, the upper topography 61 of access port 10 may be defined by upper surface 60 in combination with side regions 54 and rounded corner regions 30. Such a configuration may provide an access port having at least one feature that may be perceived by palpation.

FIGS. 22 and 23 show a perspective view and a top elevation view of another embodiment of an access port including a generally triangular exterior geometry. More particularly, as shown in FIGS. 22 and 23, a cap 14 and base 16 (collectively forming a housing) may capture a septum 118 to form an access port 10. Further, outlet stem 31 may include a stem base that may be positioned within and sealed to an outlet recess 93 formed within base 16. The outlet stem 31 may be in fluid communication with a cavity formed within the access port 10. Optionally, suture plugs 89 may be positioned within suture cavities 91 formed in base 16. Suture plugs 89 may comprise a pliant material (e.g., silicone, rubber, etc.) that may provide some resilience between sutures coupling the access port 10 (i.e., the base 16) to a patient. In further detail, a side periphery 95 (e.g., one or more side walls) of access port 10 may be generally triangular. Thus, cap 14 and base 16 may collectively form a generally triangular housing or body of access port 10. Also, the instant disclosure contemplates that side periphery 95 may increase or decrease in cross-sectional size (e.g., by tapering or arcuately transforming) between upper surface 161 of cap 14 and lower surface 151 of base 16. As shown in FIGS. 22 and 23, a transverse cross section (taken in a selected plane substantially parallel to lower surface 151 of base 16) of access port 10 may be larger proximate to lower surface 151 of base 16 and may be relatively smaller proximate upper surface 161 of cap 14.

Additionally, FIG. 24 shows a simplified representation of a transverse cross section of access port 10. As shown in FIG. 24, side periphery 95 of access port 10 may define three side regions 103 that extend between associated vertex regions 101. In addition, in one embodiment and as shown in FIG. 24, side periphery 95 may define a substantially equilateral generally triangular shape. As one of ordinary skill in the art will appreciate, side regions 103 may arcuately extend between associated vertex regions 101; thus, side regions 103 may form “sides” of a generally triangular shape. Further, although vertex regions 101 are rounded, it may be appreciated that such vertex regions 101 form an intersection between adjacent side regions 103. Accordingly, one of ordinary skill in the art will appreciate that the phrase “generally triangular,” as used herein, encompasses any generally three-sided geometry wherein adjacent sides intersect, without limitation. For example, the phrase “generally triangular” encompasses three sided polygons, circular triangles, equilateral triangles, etc., without limitation.

The instant disclosure also contemplates that at least one feature of an access port contemplated by the instant disclosure may not be observable visually or by palpation but, rather, may be otherwise observable. For example, the instant disclosure contemplates that at least one feature of an access port may be observable through interaction with an imaging technology such as x-ray or ultrasound. For example, in one embodiment, a metal feature (e.g., a plate or other metal geometry) may be included by an access port contemplated by the instant disclosure. As may be appreciated, such a metal feature may be represented on an x-ray generated by exposure of the access port to x-ray energy while simultaneously exposing x-ray sensitive film to x-ray energy passing through the access port. Further, the instant disclosure contemplates that a size, shape, or both size and shape of a metal feature of an access port may be configured for enhancing identification of an access port. For example, assuming that a metal feature comprises a metal plate, a size, shape, or both may be selectively tailored for identification of an access port. Similarly, a feature of an access port contemplated by the instant disclosure may be tailored for detection via ultrasound interaction. Such a feature may comprise an exterior topographical feature. In another embodiment, such a feature may comprise a composite structure including two or more materials that form an interface surface that may be identified by ultrasound imaging.

The instant disclosure also contemplates that at least one feature of an access port contemplated by the instant disclosure may not be observable visually or by palpation but, rather, may be otherwise observable. For example, the instant disclosure contemplates that at least one feature of an access port may be observable through interaction with an imaging technology such as x-ray or ultrasound. The access port may be constructed of both metal and plastic. For example, in one embodiment, a metal feature (e.g., a plate or other metal geometry) may be included by an access port contemplated by the instant disclosure. As may be appreciated, such a metal feature may be represented on an x-ray generated by exposure of the access port to x-ray energy while simultaneously exposing x-ray sensitive film to x-ray energy passing through the access port. In another embodiment, the access port may incorporate a metal disk in the bottom of the plastic port. The disk may include an alphanumeric message etched in the port disk that would be visible on radiograph (x-ray). FIGS. 52A-B illustrate one embodiment of an alphanumeric message 122 etched in a disk or plate 120 in the bottom of a port 10. Further, the instant disclosure contemplates that a size, shape, or both size and shape of a metal feature of an access port may be configured for enhancing identification of an access port. For example, assuming that a metal feature comprises a metal plate, a size, shape, or both may be selectively tailored for identification of an access port. Additionally, by way of example, a metal port may be configured to leave a square imprint on an x-ray that could identify the port as a power-injectable port. Similarly, a feature of an access port contemplated by the instant disclosure may be tailored for detection via ultrasound interaction. Such a feature may comprise an exterior topographical feature. In another embodiment, such a feature may comprise a composite structure including two or more materials that form an interface surface that may be identified by ultrasound imaging.

In one exemplary example, it is contemplated that radio frequency identification technology may be employed for identification of an access port contemplated by the instant disclosure. Particularly, so-called active RFID tags are powered by an internal battery and are typically read/write devices. Currently, a suitable cell coupled to suitable low power circuitry can ensure functionality for as long as ten or more years, depending upon the operating temperatures and read/write cycles and usage. So-called passive RFID tags operate without a separate external power source and obtain operating power generated from the reader. Passive RFID tags are typically programmed with a unique set of data (usually 32 to 128 bits) that cannot be modified. Read-only tags may operate as an identifier comparable to linear barcodes which may contain selected product-specific information. Thus, passive RFID tags may be much lighter than active RFID tags, less expensive, and may offer a virtually unlimited operational lifetime. The tradeoff is that they have shorter read ranges than active tags and require a higher-powered reader.

One advantage of RFID approach is the noncontact, non-line-of-sight nature of the technology. Tags can be read through a variety of substances such as snow, fog, ice, paint, crusted grime, and other visually and environmentally challenging conditions, where other optically read technologies may be less effective. RFID tags can also be read in challenging circumstances at rapid speeds, in most cases responding in less than about 100 milliseconds.

While certain representative embodiments and details have been shown for purposes of illustrating aspects contemplated by the instant disclosure, it will be apparent to those skilled in the art that various changes in the methods and apparatus disclosed herein may be made without departing form the scope contemplated by the instant disclosure, which is defined in the appended claims. For example, other access port sizes and shapes may be employed; and various other embodiments and structures may be employed for forming at least one identifiable feature of an access port contemplated by the instant disclosure. In particular, FIGS. 25-51 illustrate a number of additional exemplary embodiments of access port 10. As is apparent from these figures, access port 10 may be formed in any number of shapes and sizes, such that any number of modifications and changes are possible to any of the embodiments described and illustrated herein without departing from the spirit and scope of the instant disclosure. 

1. A venous access port assembly for implantation into a patient, comprising: a housing having a discharge port, a needle-penetrable septum, and a cap securable to the housing and retaining the septum securely in the assembly, the housing having a housing base defining a bottom wall of at least one reservoir, and an outwardly facing bottom surface, the housing base including radiopaque alphanumeric characters that convey to a practitioner that the venous access port assembly is power injectable when an X-ray of the patient is taken after implantation.
 2. The assembly of claim 1, wherein the radiopaque alphanumeric message is applied to a surface of the housing base.
 3. The assembly of claim 1 wherein the radiopaque alphanumeric message is applied to the outwardly facing bottom surface of the housing base.
 4. The assembly of claim 1, wherein the radiopaque alphanumeric characters include the letters “C” and “T”.
 5. A venous access port assembly for implantation into a patient, comprising: a housing having an outlet, and a needle-penetrable septum, the needle-penetrable septum and the housing together defining a reservoir, wherein: the assembly includes a radiopaque alphanumeric message observable through interaction with X-rays subsequent to subcutaneous implantation of the assembly, and the alphanumeric message indicating that the assembly is power injectable.
 6. The assembly of claim 5, wherein the alphanumeric message includes an abbreviation for computed tomography.
 7. The assembly of claim 5, wherein the alphanumeric message is applied to the exterior of the assembly.
 8. A venous access port assembly for implantation into a patient, comprising: a housing and a needle-penetrable septum together defining a reservoir; and the housing including an outlet and a radiopaque alphanumeric message observable through interaction with X-rays subsequent to subcutaneous implantation of the assembly into the patient, the radiopaque alphanumeric message identifying the venous access port assembly as suitable for power injection.
 9. The assembly of claim 8, wherein the radiopaque alphanumeric message includes “C” and “T”.
 10. A venous access port assembly for implantation into a patient, comprising: a housing and a needle-penetrable septum together defining a reservoir; and the housing including radiopaque markings including the alphanumeric message “CT” that conveys to a practitioner when an X-ray of the patient is taken after implantation that the venous access port assembly is suitable for power injection. 